If you've got red hair, it's your time to celebrate because World Redhead Day is Tuesday, May 26.

While National Love Your Red Hair Day pops up every November, redheads also get another unofficial holiday each May.

It's not clear where this holiday got its start, but it's become an integral part of the unofficial holidays calendar.

So to help everyone celebrate, here are 10 fun facts about the redheads in your life:

1. Less than 2% of the world's population has red hair. The highest concentration of redheads is in Scotland (13%), followed by Ireland (10%).

2. Having red hair and blue eyes is the rarest hair/eye color combination possible. The odds of a person having both of those recessive traits is around 0.17%. Instead, most redheads have brown, hazel or green eyes, according to Medical Daily.

3. TheRedhead Days festival is the largest international event for natural redheads, but it was actually started by a blonde. The annual event in the Netherlands began when painter Bart Rouwenhorst put an ad in the newspaper for 15 redheads to model for him and more than 150 called him.According to National Geographic, Rouwenhorst didn't want to turn anyone away so he got them all together so they could do a lottery to decide who would model, and that's how the festival started. Today it's grown into a massive three-day festival that attracts thousands from all around the world. This year was supposed to mark the festival's 15th anniversary, but organizers have had to cancel it because of the coronavirus. Instead, they plan to move the 15th anniversary celebration to 2021.

4. Researchers believe redheads are more sensitive to pain because of a mutation in a gene (MC1R) that affects hair color. A 2004 study showed that redheads, on average, need about 20% more general anesthesia than people with dark hair or blonde color.

5. A lot of redheads also wind up being left-handed. Researchers believe one explanation is that both of those characteristics are recessive traits and those often come in pairs.

Click here for more fun facts about redheads from News 2